Assighoe



Patented ug. 7, 1928.

UNITED STATES Partnr THOMAS MIIDGLEY, 0F HA'MPDEN', h'lAilSAC-IUEWJSS, ASSGNOR T0 `TIE-11E FISH RUBBER COMPANY, `OF Gl-IIGEEE FALLS, MASSACHUSETTS, A. CORPRATION F MASSACII SETTS.

BEVELING AND SEALING' CLAME.

Application led July 24, 1925; Serial No. 45,899.

1n the manufacture of rubber tubes, such as inner tubes for automobile tire casings, it is customary to vulcanize the rubber tube on a smooth mandrel while its ends are sealed to the mandrel either by tape or by a nietallic clamp. 1t the tube is to be spliced into endless form it has also been proposed to do the skit/ing of the ends, necessary (for a satisfactory splice, by means et a suitable shapinp; oit these metal clamps. My present inveiition relates to clamps et this character, eon'ibining preferably both the sealinp,` and sltivings;` functions, and has 'for its objective the improvement oit existing` claims in certain particulars, oit which those set forth below are et perhaps the most importance, and also the improvement of methods ot making tubes. Une object is to substantially eliminate the vulcanization of excess inaterial on the ends of the tube, permitting on the contrary the removal of this excess ma terial prior to vulcanizatien and consequently at a time when this material may be utilined without undergoing the process ot reclaiming. Another object is to facilitate the positioning of the clamp with accuracy upon the mandrel, so that tubes of exact length may be produced. Another object is to provide a clamp which may be applied to the mandrel by mechanical means. Another ob ject is to provide a clamp which will of itselt sltive the tube and trim it accurately to length. Another object is to provide a clamp which, While of rigid construction, will accommodate small variations in the site et the tube mandrels.

Although the fundamentals oit the inven tion may be given various forms, I have described the preferred way of constructingr such a clamp in the accompanying),` drawings, in which Fig. 1 is a view of a mandrel with an un cured rubber tube thereon, ready for the ap plication ot a clamp;

l3`ifg. 2 is a half section of the mandrel and tube with a clamp in process of applica tion; v

Fig. 3 is a similar `view showing the clamp tully applied;

Fig. l is a view similar te Fie. 3 but. showing; a clamp of this character adapted for use with circular inandrels; and

Fig. 5 is a split end view o1 the mandrel and clamp, showing` at the lett the clamp in process ot application, and at the right the `clamp fully applied.

i rlhe clamp in its preferred 'form comprises `two matingl seinicirculai.' halves 10 beveled inl ially at 11 to the angle desired for the skired surface ot the tube. rlhe smaller end 12 oi these halves preferably has al lip 18, 'forming4 a shoulder 1/1 at one side and presenting' an edge sufficiently acute to sever the aw rubber et the tube when the clamp is applied. Vl`lie edge ol" the lip is made ol the circumference et the outside of the niiandrel. The outer sui-'face oit the halves is vformed with a portion having; av relatively acute taper 15, near the snfiall end 12, adjoined by a portion 1G et a small driving taper of,

tor example, 0.625 per `foot. Fitting snugly around the clamp halves when the clamp is 'fully assembled is a ring 17 whose `inner surface is lorined to the same taper as the portion 16. rlhe mandrel 18 and the rubber tube 19 mounted thereon clearly ap pear from the drawings.

In use the two halves 10 are first assem bled loosely around the tube, conveniently by a mechanical locating device although the clamp may be assembled readily by hand. rlhe edges only et the clamp halves touch the rubber in this position, the remainder ot the inner surface olf the clamp arching, away from the rubber. The ring 1i' is now 'l'oifced over .the two halves, as by hydraulic or mechanical pressure, lirst contacting with the sharp taper 15 to start the clamp halves into position and then passing` onto the grad ual taper 16 to give an intensified although more rra dual pressure. its the ring is torced home the surplus ruber is -forced out and cut olli both at the mating; suitaces 9.() of the two halves and along` the lip 13. The mating,` surfaces of the clamp halves are cut away as at 21 to peri'nit the escape ot this material. When the clamp has been entirely closed these surfaces will be pressed lirinly together, shearing oil the extruded rubber caught between them and the lip 13 will be pressed against the mandrel to cut olif any excess length oi the rubber tube as originally placed on the mandrel.. These pieces Q2 ot surplus rubber are preferably reuiieved bef iore vulcanization, since its value much greater in the uncurcd state. The lip 13 per- A.. E. NELSON MANHOLE COVER FOR OIL TANKS Filed March 15 1926 Hamam, 

